Is render the best background for shower/bath tiling?

[Albumen]

The bath is out. The old tiles are off. The first 3 feet up from where the bath was is sand and cement. A bit rough with old tile adhesive, but generally sound. Last 4 feet up to ceiling is plaster. Presumably lime plaster, as it's a 1920s house. Painted with a few bits of skim flaked off and a couple of 'hollow' sections.

I'm 52. I'm putting an expensive bath in. It'll have an over-bath shower above it. I don't EVER want to do any of this again. I want to do this job once, as well as it possibly can be. I can't stand this permanent house 're-modelling' that seems to be the way these days. In 50 years when I'm pushing up daisies I want my son/daughter to be still using that bath without any leaks.

Although I'm doing the plumbing myself, I'll employ a plasterer and a tiler, as those jobs affect the finish.

Should I get this wall re-rendered? Should I ask the plasterer to add waterproofer, if so what? And what tanking product before tiling, if any?

Many thanks.

 

[joe-90]

Any decent tiler will do the prepping. Plasterers are only interested in getting a smooth finish. What the tiler needs is a perfectly flat finish.

If the substrate is sound and very flat - tile straight onto it.

 

[tictic]

you have imo 2 options
what type/size/..weight are the tiles you plan on fixing.

render will take 32kg per m2.

12.5mm cementbased backerboard the walls out(45kg + per m2)

what will be more cost affective for you?speak to your tile fixer first mate.
and as above the tilefixer should be able to render/screed(floor)/plaster the walls for you,its part of his/her job, its called wall and floor preperation ...